function ajaxSend(url, string, div_id)
{
  var ajaxObj=null;
  if(window.XMLHttpRequest)
  {
    ajaxObj=new XMLHttpRequest();
  }
  else if(window.ActiveXObject)
  {
    ajaxObj=new ActiveXObject("Microsoft.XMLHTTP");
  }
  else
  {
    return;
  }
 
  document.getElementById(div_id).innerHTML='<p><h3>Подождите - идет обмен данных с сервером.</h3></p>';

  ajaxObj.onreadystatechange = function()
  {
    if(ajaxObj.readyState==4)
    {
      document.getElementById(div_id).innerHTML=ajaxObj.responseText;

    }
  }
  ajaxObj.open('POST', url, true);
  ajaxObj.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded;');
  ajaxObj.send(string);

}